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Subject: search.filters.subject.Finite element modeling

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    Evaluating Failure Patterns and Bursting Loads in Concrete Segmental Bridge Piers: A Comprehensive Study
    (2025-06-01)
    Suparp, Suniti
    ;
    Ejaz, Ali
    ;
    Gadagamma, Chaitanya Krishna
    ;
    Saingam, Panumas
    ;
    Hussain, Qudeer
    This study presented an experimental and numerical investigation focused on pier segments of segmental bridge types. The pier segments were constructed to represent Lak Si Overpass Highway Route No. 304, Thailand. The experimental program included five pier segments with similar reinforcement details but varying concrete strengths. The numerical work validated the finite element model (FEM) using experimental results and conducted a parametric study to assess the impact of steel reinforcement variation and concrete compressive strength on the bursting capacity of pier segments. Key findings included a consistent failure pattern characterized by a prominent vertical crack and concrete crushing at the bottom, particularly in specimens with lower concrete strength. The bursting loads exhibited a decrease corresponding to a reduction in compressive strength, with up to a 20% decrease observed when strength was reduced by 20%. The finite element analysis (FEA) results slightly surpassed experimental findings, yet the marginal discrepancies confirmed the accuracy of the advanced tool for engineering nonlinear analysis (ATENA) computer program in predicting bursting forces. The parametric study highlighted a substantial increase in bursting loads with variations in concrete strength and the number of steel reinforcement layers, with a non-proportional relationship between bursting load and concrete strength.
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    Design consideration and finite element modeling of MEMS cantilever for nano-biosensor applications
    (2005-01-01)
    Klaitabtim, Don
    ;
    Tuantranont, Adisorn
    This work has focused on the design and finite element modeling of a MEMS cantilever beam for biosensor applications. The stress induced on gold surface with polysilicon piezoresistive sensing is demonstrated. In principle, adsorption of biochemical species on a functionalized surface of the microfabricated cantilever will cause a surface stress and consequently the cantilever bending. The sensing mechanism relies on the piezoresistive properties of the polysilicon wire encapsulated in the beam. The beam is constructed and bending analysis is performed so that the beam tip deflection could be predicted. The twelve independent beams were combined onto a single chip. The piezoresistor designs on the beams were varied, within certain constraints, so that the sensitivity of the sensing technique could be studied. The chip was laid out using Tanner L-edit and the design rules of the MUMPs process were followed. The device model was simulated using CoventorWare™, a commercial finite element analysis (FEA) tool designed specifically for MEMS applications. Finally, the MEMS cantilever beam was operated and caused increment in tip deflection due to biochemical adsorption on the gold surface. ©2005 IEEE.